/* ibsi.c:
	Insert Boot Sector Information
	This tool will run a crc32 on a binary file starting at some offset, then
	insert that crc32 into the binary file at some offset.  This is used in
	conjunction with the monitor's optional boot-sector saftey startup mode.
*/
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "utils.h"

#ifdef BUILD_WITH_VCC
typedef unsigned long ulong;
typedef unsigned short ushort;
#endif

#ifndef O_BINARY
#define O_BINARY 0
#endif

typedef unsigned char uchar;

int verbose, debug;

char *usage_txt[] = {
	"Usage: ibsi [c:di:v] {in_file}",
	" Options:",
	" -b{###}       base address at which the monitor is built for",
	" -c{###}       offset at which the crc calculation begins (def=0)",
	" -i{###}       offset into which the crc is inserted (def=0)",
	" -l            target is little-endian (def=big endian)",
	" -o{name}      name of output file (def=in_file.bsi)",
	" -V            display version of tool",
	" -v            verbose mode",
	0,
};

/* crc32tab[]:
	Used for calculating a 32-bit CRC.
*/
unsigned long crc32tab[] = {
	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
	0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 
	0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
	0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 
	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
	0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 
	0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
	0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 
	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
	0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 
	0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
	0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 
	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
	0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 
	0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
	0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 
	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
	0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 
	0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
	0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 
	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
	0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 
	0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
	0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 
	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
	0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 
	0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
	0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 
	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
	0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 
	0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
	0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 
	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
	0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 
	0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
	0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 
	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
	0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 
	0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
	0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 
	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
	0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 
	0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

/* crc32():
	The common CRC-32 code.
*/
ulong
crc32(buffer,nbytes)
uchar *buffer;
ulong nbytes;
{
	int	temp;
	unsigned long crc_rslt;

	crc_rslt = 0xffffffff;
	while(nbytes) {
		temp = (crc_rslt ^ *buffer++) & 0x000000FFL;
		crc_rslt = ((crc_rslt >> 8) & 0x00FFFFFFL) ^ crc32tab[temp];
		nbytes--;
	}
	return(~crc_rslt);
}

int
main(int argc,char *argv[])
{
	ulong	crc, *bip, baseofimage;
	struct	stat filestat;
	char	*filename, *filespace, *bsifile;
	int		fd, crcoffset, insertoffset, opt, targetisle, doconversion;
	
	debug = 0;
	verbose = 0;
	bsifile = (char *)0;
	crcoffset = 0;
	targetisle = 0;
	insertoffset = 0;
	baseofimage = 0;
	while ((opt=getopt(argc,argv,"b:c:i:lo:Vv")) != EOF) {
		switch(opt) {
		case 'b':
			baseofimage = strtol(optarg,(char **)0,0);
			break;
		case 'c':
			crcoffset = strtol(optarg,(char **)0,0);
			break;
		case 'i':
			insertoffset = strtol(optarg,(char **)0,0);
			break;
		case 'l':
			targetisle = 1;
			break;
		case 'o':
			bsifile = optarg;
			break;
		case 'v':
			verbose = 1;
			break;
		case 'V':
			showVersion();
			break;
		default:
			usage(0);
		}
	}

	if (argc != (optind+1))
		usage("Bad arg count");

	if (insertoffset & 3) {
		fprintf(stderr,"Insertion offset must be mod4.\n");
		exit(1);
	}
	if ((insertoffset < 0) || (crcoffset < 0)) {
		fprintf(stderr,"Offset can't be negative.\n");
		exit(1);
	}

	filename = argv[optind];
	if (crcoffset <= insertoffset) { 
		fprintf(stderr,
			"\007Warning: crc calculation offset < crc insertion offset\n");
	}

	/* Open the file and pull it into memory space so that we can run the */
	/* crc on it... */
	if ((fd = open(filename,O_RDONLY | O_BINARY)) == -1) {
		perror(filename);
		exit(1);
	}
	stat(filename,&filestat);
	filespace = Malloc(filestat.st_size);
	Read(fd,filespace,filestat.st_size);
	close(fd);

	crc = crc32(filespace+crcoffset,filestat.st_size-crcoffset);
	
#ifdef BUILD_WITH_VCC
	if (targetisle)
		doconversion = 0;
	else
		doconversion = 1;
#else	/* assume some kind of SUN */
	if (targetisle)
		doconversion = 1;
	else
		doconversion = 0;
#endif

	if (verbose && doconversion)
		printf("Converting endianness to be opposite that of this host.\n");

	bip = (ulong *)(filespace+insertoffset);
	bip[0] = otherEnd32(doconversion,baseofimage+crcoffset);	
	bip[1] = otherEnd32(doconversion,filestat.st_size-crcoffset);	
	bip[2] = otherEnd32(doconversion,crc);	

	/* Now write the modified file content to the bsi file... */
	if (!bsifile) {
		bsifile = Malloc(strlen(filename) + 16);
		sprintf(bsifile,"%s.bsi",filename);
	}
	if ((fd = open(bsifile,O_WRONLY|O_BINARY|O_CREAT,0777)) == -1) {
		perror(bsifile);
		exit(1);
	}
	Write(fd,filespace,filestat.st_size);
	close(fd);

	printf("Bootsector information inserted at offset 0x%x:\n",
		insertoffset);
	printf(" START=0x%08x, SIZE=0x%08x, CRC32=0x%08x\n",
		baseofimage+crcoffset,filestat.st_size-crcoffset,crc);
	exit(0);
}

